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High severityNVD Advisory· Published Nov 6, 2025· Updated Nov 6, 2025

runc container escape via "masked path" abuse due to mount race conditions

CVE-2025-31133

Description

runc is a CLI tool for spawning and running containers according to the OCI specification. In versions 1.2.7 and below, 1.3.0-rc.1 through 1.3.1, 1.4.0-rc.1 and 1.4.0-rc.2 files, runc would not perform sufficient verification that the source of the bind-mount (i.e., the container's /dev/null) was actually a real /dev/null inode when using the container's /dev/null to mask. This exposes two methods of attack: an arbitrary mount gadget, leading to host information disclosure, host denial of service, container escape, or a bypassing of maskedPaths. This issue is fixed in versions 1.2.8, 1.3.3 and 1.4.0-rc.3.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
github.com/opencontainers/runcGo
< 1.2.81.2.8
github.com/opencontainers/runcGo
>= 1.3.0-rc.1, < 1.3.31.3.3
github.com/opencontainers/runcGo
>= 1.4.0-rc.1, < 1.4.0-rc.31.4.0-rc.3

Affected products

298

Patches

Vulnerability mechanics

References

7

News mentions

0

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